1. AAP. (1989).The American Academy of Periodontology. Proceedings of the World Workshop in Clinical Periodontics. Chicago: The American Academy of Periodontology 1‐22.
2. AAP. (1999).1999 International Workshop for a Classification of Periodontal Diseases and Conditions. Papers. Oak Brook Illinois October 30‐November 2 1999.Annals of Periodontology4 1‐112. URL:https://aap.onlinelibrary.wiley.com/toc/21625131/1999/4/1
3. The American Academy of Periodontology. Parameters of care;AAP;Journal of Periodontology,2000
4. Manifestations of systemic diseases and conditions thataffect the periodontal attachment apparatus: Case definitions and diagnostic considerations;Albandar J. M.;Journal of Clinical Periodontology,2018
5. A new classification scheme for periodontal and peri‐implant diseases and conditions—Introduction and key changes from the 1999 classification;Caton J. G.;Journal of Periodontology,2018